Very interesting! Produce Row is still there, but it is now located about 1.5 miles north of Washington Avenue near Broadway and North Market. I never heard it referred to as Commission Row.
I didn't think of National Candy, but I know that building. I think the third street bordering the block is Meramec. Here is some information about the building, from when it was added to the National Register of Historic Places:http://route66news.com/2009/11/13/st-louis-factory-building-...
I believe the City Sanitorium is now referred to as the Psychiatric Rehabilitation Hospital. The original building is a beautiful coupola-domed structure visible from almost anywhere in the southwest part of the city. Here's a bit more information:http://dmh.mo.gov/slprc/history.htm